CUPA ORP PGB 2 06

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Treatment Plant Ozone Retrofit Program California Unified Program 8th Annual Training Conference February 8, 2006 Presented by: Paul G. Beswick Metropolitan Water District of Southern California Environmental Support Services (213) 217-5533 pbeswick@mwdh2o.com

Southern California’s Imported Water: 

Southern California’s Imported Water SERVICE AREA Lower Salinity High DBPs High Salinity Low DBPs

Drivers for Treatment Improvements: 

Drivers for Treatment Improvements Water Quality Regulatory compliance Salinity management Taste-and-odor control System Operations Remove plant capacity limitations Maximize flexibility of supply

Plant Process Layout: 

Plant Process Layout

Plant Process Flow Diagram: 

Plant Process Flow Diagram Meter Flash Mix Flocculation Sedimentation Filtration Finished Water Reservoir Filter Aid Chlorine Floc Aid To Member Agency Connection Ozone Contactors Oxygen Generation Ozone Generation Hydrogen Peroxide Ozone Ozone Destruct LOX

ORP General Design Criteria: 

ORP General Design Criteria Plant Flow Range is 60 to 750 MGD Design Ozone Dose of 2.6 mg/L at 750 mgd 8.6% Design Ozone Concentration O3 Generation up 15,000 lb/day Contactors Designed for 10 Minute HDT

Ozone Process Flow Diagram: 

Ozone Process Flow Diagram LOX TANK OPERATING = 2 STANDBY = 1 FUTURE = 1 OPERATING = 1 STANDBY = 1 DEFROST = 1 FUTURE = 1 LOX VAPORIZER LIQUID OXYGEN FEED GAS SYSTEM PSU OZONE GENERATOR OPERATING = 4 STANDBY = 1 FUTURE = 2 OZONE GENERATION SYSTEM OZONE CONTACTOR OZONE CONTACTOR SYSTEM VENT OZONE DESTRUCT SYSTEM OPERATING = 6 STANDBY = 0 FUTURE = 2 OPERATING = 5 STANDBY = 1 FUTURE = 4 OPERATING = 2 STANDBY = 1 FUTURE = 1 HEATER OZONE DESTRUCT CATALYST BED DESTRUCT BLOWER NITROGEN SYSTEM COMPRESSOR RECEIVER TANK DRYER OPERATING = 1 STANDBY IS A BOTTLE SYSTEM

ORP Chemical Storage: 

ORP Chemical Storage

LOX Tank Farm: 

LOX Tank Farm

Ozone Building: 

Ozone Building

Ozone Generators: 

Ozone Generators

Ozone Contactor Schematic: 

Ozone Contactor Schematic Ozone Feed Gas Ozone Off Gas Hydrogen Peroxide Raw Water

Contactor Gallery: 

Contactor Gallery

Lessons Learned: 

Lessons Learned Standardized Alarm Beacons Disconnected Sample Line Vent to Contactor Warning Signals on Ozone Building Roof Safety Signs Throughout Facilities Automatic Shutoffs in Boiler Room New Gasket Material for Sulfuric Acid New Gasket Material for Ozone System Contactor Sample System Modification Added check valve at O3 generator outlet Seal Drain Sumps and Contactor Cover Plates 1 Year Life on O3 Ambient Detector Probes